Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Anna Baran-Sadleja"

Microstructure and hardness of aged Ti-10V-2Fe-3Al near-beta titanium alloy DOI:10.15199/28.2017.4.1

  1. INTRODUCTION Progress in aerospace is linked with the development and application of the new structural materials. Those materials are characterized by higher strength, lower density and good resistance to environmental factors also at high temperature, while compared with materials which are in use. With the development of materials new technologies are also developed for their processing. They allow the use of the material in real components and lead to improved properties of the elements design, materials savings and reduced manufacturing cost. This applies to both: new and conventional materials used in the construction of aircraft engines [1÷3]. The near-β titanium alloys are characterized by good ductility and low susceptibility to cracking, which classify them as alloys suitable for deformation [4]. One of them, Ti-10V-2Fe-3Al alloy, can be used at elevated temperature and under variable loads, is resistant to atmospheric and sea water corrosion as well [5]. All these aspects along with weight savings facilitated its use in forged components of aircraft structures. According to the literature data, the morphology of microstructure constituents and thus operational properties of the near-β titanium alloys may be changed suitably controlling the heat treatment parameters (temperature and time). Solution treatment from the temperature, where both phases: α and β exist allows to create globular precipitates of phase α. Heating the alloy to a temperature above the phase transformation temperature and the subsequent cooling below the temperature of β phase stability makes possible the precipitation of α phase in the form of needles in an amount dependent on the heat treatment parameters [4]. It is worth to notice that during cooling of near-β titanium alloys the martensitic transformation is possible. This transformation is induced by previous plastic deformation, when the α phase volume fraction materia[...]

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